10 files declare their use of HttpExceptionInterface in Zircon Profile 8

authorize.php in core/authorize.php

Administrative script for running authorized file operations.

DefaultExceptionHtmlSubscriber.php in core/lib/Drupal/Core/EventSubscriber/DefaultExceptionHtmlSubscriber.php

Contains \Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber.

DefaultExceptionSubscriber.php in core/lib/Drupal/Core/EventSubscriber/DefaultExceptionSubscriber.php

Contains \Drupal\Core\EventSubscriber\DefaultExceptionSubscriber.

DrupalKernel.php in core/lib/Drupal/Core/DrupalKernel.php

Contains \Drupal\Core\DrupalKernel.

ExceptionListener.php in vendor/symfony/http-kernel/EventListener/ExceptionListener.php

ExceptionLoggingSubscriber.php in core/lib/Drupal/Core/EventSubscriber/ExceptionLoggingSubscriber.php

Contains \Drupal\Core\EventSubscriber\ExceptionLoggingSubscriber.

FlattenException.php in vendor/symfony/debug/Exception/FlattenException.php

HttpExceptionSubscriberBase.php in core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php

Contains \Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase.

HttpKernel.php in vendor/symfony/http-kernel/HttpKernel.php

rebuild.php in core/rebuild.php

Rebuilds all Drupal caches even when Drupal itself does not work.